Precision stamping dies for mass production of 1500MPa grade cold-forming steel

Abstract

This utility model discloses a precision stamping die for mass production of 1500MPa grade cold-formed steel, relating to the field of cold-formed steel stamping technology. The precision stamping die for mass production of 1500MPa grade cold-formed steel includes a base, a frame fixedly mounted on top of the base, a lower die base fixedly mounted on the base, two hydraulic presses fixedly mounted on the top of the frame, pressure plates fixedly mounted on the piston ends of the two hydraulic presses, two guide sleeves fixedly mounted below the pressure plates, two guide pillars slidably mounted within the two guide sleeves, four support rods slidably mounted on the pressure plates, the lower ends of the four support rods fixedly connected to a pad, and four springs respectively sleeved on the four support rods, the upper ends of the springs fixedly connected to the lower surface of the pressure plates. This design greatly improves the precision of stamped parts and reduces the scrap rate. The design of the support rods, pads, and springs allows the springs to push the pads to assist in unloading after stamping, making the unloading process smoother and improving production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of cold forming steel stamping technology, and in particular to a precision stamping die for mass production of 1500MPa grade cold forming steel. Background Technology

[0002] In the current field of cold-formed steel stamping production, especially for the processing of high-strength steel such as 1500MPa grade, traditional stamping methods face many severe challenges, which seriously restrict the improvement of production efficiency and product quality. Traditional stamping dies suffer from poor overall structural stability, lacking a robust foundation and frame design, making them prone to wobbling and displacement during the stamping process. This not only affects stamping accuracy but also causes uneven stress on various die components, significantly shortening the die's lifespan. Frequent die repairs and replacements lead to production stoppages, increase production costs, and reduce production efficiency. The imperfection of the positioning and ejection system is a major drawback of traditional stamping dies. The positioning of the blank is not precise enough, making it difficult to guarantee the dimensional accuracy of the stamped parts, resulting in poor product consistency and a large number of scraps, which wastes materials and resources. Moreover, after stamping, the ejection process of the workpiece is not smooth, and the workpiece often gets stuck in the die, requiring manual assistance to remove it. This not only increases the labor intensity of workers, but also makes it easy to damage the workpiece due to improper operation, further reducing product quality. Traditional dies also have shortcomings in terms of stamping power and guidance. The power supply method makes it difficult to precisely control the stamping pressure and stroke, resulting in instability in the stamping process. This makes it impossible to meet the stringent requirements of high-strength materials such as 1500MPa grade cold-forming steel for stamping processes. At the same time, the lack of a precise guiding mechanism makes it easy for the upper and lower dies to deviate during movement, causing the punch and die to not align accurately. This not only affects the accuracy of the stamped parts but also accelerates die wear and shortens the die's service life. The unloading process has also become a bottleneck in the efficiency of traditional stamping dies. Without a reasonable unloading auxiliary design, the unloading process is time-consuming and labor-intensive, and problems such as incomplete unloading or damage to the workpiece during unloading are likely to occur. This not only prolongs the single stamping cycle and reduces production efficiency, but also increases the defect rate of products and affects the economic benefits of enterprises. Furthermore, traditional stamping dies have poor versatility and adaptability, making it difficult to meet diverse production needs. For cold-formed steel stamping parts of different specifications and shapes, custom-made dies are often required. This not only increases the manufacturing cost and cycle time of the dies but also occupies a large amount of storage space. Moreover, the installation and debugging process of the dies is complex, requiring professional technicians to spend a lot of time operating them, further reducing production efficiency and making it unable to adapt to rapidly changing market demands. In summary, traditional stamping methods have many shortcomings when dealing with mass production stamping tasks of 1500MPa grade cold-formed steel, in terms of structural stability, positioning and ejection, power and guidance, unloading and versatility. Utility Model Content

[0003] The purpose of this invention is to solve at least one of the technical problems existing in the prior art, and to provide a precision stamping die for mass production of 1500MPa grade cold-forming steel, which can solve the problems of inaccurate blank positioning, poor product dimensional accuracy and poor ejection in traditional dies.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A precision stamping die for mass production of 1500MPa grade cold-forming steel includes a base, a frame fixedly installed on the top of the base, a lower die base fixedly installed on the base and located inside the die cavity, a top plate slidably installed inside the die cavity, four ejector rods fixedly installed on the lower surface of the top plate, all four ejector rods being hydraulically driven, two guide pillars fixedly installed on both sides above the die cavity, and multiple rubber pads fixedly installed on the upper surface of the die cavity. Two hydraulic presses are fixedly installed at the top of the frame. A pressure plate is fixedly installed on the piston end of the two hydraulic presses. Two guide sleeves are fixedly installed below the pressure plate. Two guide columns are slidably installed in the two guide sleeves respectively. Four support rods are slidably installed on the pressure plate. The lower ends of the four support rods are fixedly connected to the pad. Four springs are respectively sleeved on the four support rods. The upper ends of the springs are fixedly connected to the lower surface of the pressure plate. The pressure plate has threaded holes and bolts. A punch is fixedly installed below the pressure plate by bolts. The pad is sleeved outside the punch and can slide relative to the punch. An upper die seat is slidably installed inside the punch. A telescopic rod is fixedly installed at the upper end of the upper die seat. The upper end of the telescopic rod is fixedly installed on the pressure plate by bolts.

[0005] Preferably, the four push rods are rectangularly distributed on the lower surface of the top plate, and the four push rods are driven by the same hydraulic control system to achieve synchronous extension and retraction.

[0006] Preferably, the outer side wall of the guide post is provided with an axial guide protrusion, and the inner side wall of the guide sleeve is provided with a guide groove adapted to the guide protrusion, and the guide protrusion is slidably embedded in the guide groove.

[0007] Preferably, the plurality of rubber pads are evenly distributed around the cavity edge of the die, and the upper surface of the rubber pads can contact and fit with the lower surface of the pad plate.

[0008] Preferably, the spring is in a slightly compressed state in the initial state, and the spring applies a downward preload to the pad, so that the pad always has a tendency to move towards the die.

[0009] Preferably, the upper end of the punch is provided with a flange, and the flange is provided with a through hole corresponding to the threaded hole of the pressure plate. The bolt passes through the through hole and the threaded hole in sequence to detachably and fix the punch and the pressure plate.

[0010] Preferably, the outer side wall of the upper mold base is provided with a limiting protrusion ring, and the inner side wall of the punch is provided with a limiting step adapted to the limiting protrusion ring. The limiting protrusion ring and the limiting step cooperate to prevent the upper mold base from falling out of the punch.

[0011] Preferably, the pad is made of wear-resistant metal, and the inner wall of the pad is clearance-fitted with the outer wall of the punch to ensure that the pad slides smoothly along the axial direction of the punch.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This 1500MPa grade cold-forming steel mass production precision stamping die has a stable base and frame structure to ensure the overall stability of the die and lay a solid foundation for stamping work. The combination of the lower die base, die cavity, top plate and ejector pin can accurately position and efficiently eject the stamped parts. The rubber pad on the die cavity buffers the impact force, avoids damage to the workpiece and die cavity, and can also prevent blank displacement and improve stamping accuracy.

[0013] 2. This precision stamping die for mass production of 1500MPa grade cold-forming steel uses a hydraulic press to provide powerful force. The punch is driven by the pressure plate to perform stamping. The sliding fit between the guide post and the guide sleeve ensures precise alignment of the upper and lower dies, greatly improving the accuracy of stamped parts and reducing the scrap rate. The design of the support rod, pad, and spring allows the spring to push the pad to assist in unloading after stamping, making the unloading process smoother and improving production efficiency.

[0014] 3. This precision stamping die for mass production of 1500MPa grade cold-formed steel features a punch that is bolted to the bottom of the pressure plate for easy installation and replacement, meeting various stamping requirements. The upper die base and telescopic rod enhance the stability and adaptability of the punch, allowing for fine adjustment of the stamping position and force. In addition, detailed designs such as the hydraulic drive of the ejector pin, the guiding structure of the guide post and guide sleeve, and the distribution of rubber pads further optimize the die performance, enabling it to better handle the mass production stamping of 1500MPa grade cold-formed steel, thereby improving production quality and efficiency in multiple ways. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of a precision stamping die for mass production of 1500MPa grade cold-forming steel according to this utility model; Figure 2 This is a schematic diagram of a precision stamping die for mass production of 1500MPa grade cold-forming steel according to this utility model; Figure 3 This is a cross-sectional schematic diagram of the precision stamping die for mass production of 1500MPa grade cold-forming steel according to this utility model; Figure 4 This is a cross-sectional schematic diagram of the precision stamping die for mass production of 1500MPa grade cold-forming steel according to this utility model.

[0016] Reference numerals in the attached drawings: 1. Base; 2. Frame; 3. Die; 4. Backing plate; 5. Support rod; 6. Spring; 7. Pressure plate; 8. Hydraulic press; 9. Guide sleeve; 10. Guide post; 11. Rubber pad; 12. Ejector rod; 13. Telescopic rod; 14. Punch; 15. Upper die base; 16. Top plate; 17. Lower die base; 18. Bolt. Detailed Implementation

[0017] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] Please see Figure 1-4This utility model provides a technical solution: a precision stamping die for mass production of 1500MPa grade cold forming steel, including a base 1, a frame 2 fixedly installed on the top of the base 1, a lower die base 17 fixedly installed on the base 1 and located inside the die cavity 3, a top plate 16 slidably installed inside the die cavity 3, four ejector rods 12 fixedly installed on the lower surface of the top plate 16, all four ejector rods 12 are hydraulically driven, two guide pillars 10 are fixedly installed on both sides above the die cavity 3, and multiple rubber pads 11 are fixedly installed on the upper surface of the die cavity 3; The base 1 serves as the basic support structure of the entire mold, bearing the weight of other components and providing a stable installation platform. The frame 2 is fixed above the base 1, providing support for the upper structure of the entire mold. The lower mold base 17 is fixed on the base 1 and located inside the die 3. The die 3 is one of the key components for directly stamping cold-formed steel. The lower mold base 17 provides installation positioning and support for the die 3. The top plate 16 can slide inside the die 3. The four ejector rods 12 on the lower surface of the top plate 16 can move up and down under hydraulic drive. After stamping, the hydraulically driven ejector rods 12 move upward, thereby pushing the top plate 16 upward and ejecting the stamped workpiece from the die 3. The guide pillars 10 on both sides above the die 3 serve as guides. The rubber pads 11 on the upper surface of the die 3 can, on the one hand, buffer the impact force of the upper mold pressing down during stamping, protecting the die 3 and the workpiece surface. On the other hand, they can, to a certain extent, increase the friction between the blank and the die 3, preventing the blank from shifting during the stamping process. Two hydraulic presses 8 are fixedly installed at the top of the frame 2. A pressure plate 7 is fixedly installed on the piston end of the two hydraulic presses 8. Two guide sleeves 9 are fixedly installed below the pressure plate 7. Two guide columns 10 are slidably installed in the two guide sleeves 9 respectively. Four support rods 5 are slidably installed on the pressure plate 7. The lower ends of the four support rods 5 are fixedly connected to the pad 4. Four springs 6 are respectively sleeved on the four support rods 5. The upper ends of the springs 6 are fixedly connected to the lower surface of the pressure plate 7. The two hydraulic presses 8 at the top of frame 2 are the power source for the entire stamping process. The piston end of the hydraulic press 8 drives the pressure plate 7 to move up and down. The guide sleeve 9 below the pressure plate 7 slides with the guide post 10 above the die 3 to ensure the accuracy of the up and down movement of the pressure plate 7, thereby ensuring that the punch 14 installed below the pressure plate 7 and the die 3 are accurately aligned to achieve precise stamping. The four support rods 5 slidably installed on the pressure plate 7 are connected to the pad 4 at their lower ends, and four springs 6 are sleeved on the support rods 5 and connected to the lower surface of the pressure plate 7 at their upper ends. During the stamping process, when the hydraulic press 8 drives the pressure plate 7 to move downward, the springs 6 are compressed, and the pad 4 moves downward with the pressure plate 7. When the stamping is completed and the piston end of the hydraulic press 8 returns, the springs 6 restore their elastic deformation and push the pad 4 upward. This process helps to remove the stamped part from the punch 14 and plays an auxiliary role in unloading. The pressure plate 7 has a threaded hole and is equipped with bolts 18. A punch 14 is fixedly installed below the pressure plate 7 by bolts 18. The pad 4 is sleeved on the outside of the punch 14 and can slide relative to the punch 14. An upper mold seat 15 is slidably installed inside the punch 14. A telescopic rod 13 is fixedly installed on the upper end of the upper mold seat 15. The upper end of the telescopic rod 13 is fixedly installed on the pressure plate 7 by bolts 18. The threaded holes on the pressure plate 7 cooperate with the bolts 18 to firmly fix the punch 14 under the pressure plate 7, so that the punch 14 can punch the cold-formed steel billet as the pressure plate 7 moves up and down. The pad 4 is sleeved on the outside of the punch 14 and can slide relative to it. During the punching process, the pad 4 can move relative to the punch 14 under the action of the spring 6, which plays a role in buffering and assisting unloading. The upper die seat 15, which is slidably installed inside the punch 14, provides an internal support structure for the punch 14 and ensures the stability of the punch 14 during the punching process. The telescopic rod 13 at the upper end of the upper die seat 15 is fixed to the pressure plate 7 by bolts 18. The telescopic rod 13 can adjust the relative position of the punch 14 and the upper die seat 15 to a certain extent to adapt to different stamping process requirements, and at the same time, it also helps to maintain the stable movement of the punch 14 during the stamping process.

[0022] Working principle: When the precision stamping die for mass production of 1500MPa grade cold-formed steel is working, the hydraulic press 8 drives the piston end to move the pressure plate 7 downward. The guide post 10 slides in the guide sleeve 9 to ensure motion accuracy. The punch 14 presses down on the cold-formed steel billet with the pressure plate 7. The rubber pad 11 buffers and prevents slippage. After stamping, the hydraulic press 8 returns, and the spring 6 pushes the pad 4 to assist in unloading. At the same time, the hydraulically driven ejector rod 12 moves upward and pushes the workpiece out of the die 3 through the ejector plate 16. The telescopic rod 13 can adjust the position of the upper die base 15 to provide support. All components work together to complete the precision stamping and unloading process of cold-formed steel. The base 1 and frame 2 form a stable structure to ensure the overall stability of the mold and lay a solid foundation for stamping work. The combination of the lower mold base 17, the die 3, the top plate 16, and the ejector pin 12 can accurately position and efficiently eject the stamped parts. The rubber pad 11 on the die 3 buffers the impact force, avoids damage to the workpiece and the die, and can also prevent the blank from shifting and improve stamping accuracy. The hydraulic press 8 provides powerful force, which drives the punch 14 to stamp through the pressure plate 7. The sliding cooperation between the guide post 10 and the guide sleeve 9 ensures precise alignment of the upper and lower dies, greatly improving the accuracy of stamped parts and reducing the scrap rate. The design of the support rod 5, the pad 4 and the spring 6 allows the spring 6 to push the pad 4 to assist in unloading after stamping, making the unloading process smoother and improving production efficiency. The punch 14 is fixed to the bottom of the pressure plate 7 by bolts 18, which facilitates installation and replacement and meets different stamping requirements. The upper die base 15 and the telescopic rod 13 enhance the stability and adaptability of the punch 14, and can finely adjust the stamping position and force. In addition, the hydraulic drive of the ejector rod 12, the guiding structure of the guide post and guide sleeve, the distribution of the rubber pads 11 and other detailed designs further optimize the mold performance, enabling it to better cope with the mass production stamping of 1500MPa grade cold forming steel, and improve production quality and efficiency in many ways.

[0023] Structural Description: Base 1: The base is the basic support structure of the mold. It is block-shaped and located at the bottom of the entire mold. The frame 2 is fixedly installed on the top, and the lower mold base 17 is also fixedly installed on the upper surface. Its specific function is to bear the weight of all components such as the frame 2, the lower mold base 17, and the die 3, to provide a stable installation platform for each component, to ensure that the mold does not shift during the stamping process, and to maintain structural stability. Frame 2: The whole is a frame-type support structure, which is constructed of metal profiles. It is fixedly installed above the base 1. Two hydraulic presses 8 are fixedly installed at the top. The specific function is to provide support for the upper structure of the mold, such as the hydraulic presses 8 and the pressure plate 7, and to stably suspend the upper parts above the base 1 to form a complete stamping operation space and ensure the stability of the stamping power transmission path. Die 3: It is a block-shaped stamping component with a cavity, located above the base 1. It houses the lower die base 17 and the top plate 16. Guide pillars 10 are fixedly installed on both sides of the upper part, and multiple rubber pads 11 are fixedly installed on the upper surface. Its specific function is to serve as the lower die component for cold forming steel stamping. It cooperates with the punch 14 through its own cavity to realize the stamping of cold forming steel blanks. At the same time, it provides a mounting base for the guide pillars 10 and rubber pads 11, and works with the top plate 16 to complete the ejection of the workpiece. Pad 4: The whole is a ring-shaped sleeve made of wear-resistant metal. It is positioned outside the punch 14 and can slide relative to the punch 14. The upper end is fixedly connected to the lower end of the four support rods 5. Its specific function is to contact the rubber pad 11 on the die 3 when it moves downward with the pressure plate 7 during the stamping process, so as to buffer the impact force of the punch 14 pressing down. When the stamping is completed and the hydraulic press 8 returns, it moves upward under the action of the spring 6 to help the stamped part to be separated from the surface of the punch 14, so as to achieve auxiliary unloading. Support rod 5: It is a cylindrical metal rod that is slidably installed on the pressure plate 7. Its lower end is fixedly connected to the pad 4. A spring 6 is sleeved on the outside. Its specific function is to connect the pressure plate 7 and the pad 4, provide guidance for the up and down movement of the pad 4, ensure that the pad 4 slides smoothly in the vertical direction, and transmit the elastic force of the spring 6 so that the deformation force of the spring 6 can be effectively applied to the pad 4, thereby realizing the buffering and auxiliary unloading functions of the pad 4. Spring 6: It is a spiral elastic component, which is sleeved on the outside of the support rod 5. Its upper end is fixedly connected to the lower surface of the pressure plate 7, and its lower end is in contact with or fixedly connected to the upper surface of the pad 4. Its specific function is to be compressed as the pressure plate 7 is pressed down during stamping, store elastic potential energy, buffer the pressing speed and impact force of the punch 14, and release the elastic potential energy after stamping is completed, pushing the pad 4 to slide upward along the support rod 5, assisting the stamped part to separate from the punch 14 and reducing the difficulty of unloading. Pressure plate 7: It is a rectangular block metal component, which is fixedly installed at the piston end of the two hydraulic presses 8. The guide sleeve 9 is fixedly installed below it, the support rod 5 is slidably installed, and the punch 14 is fixedly installed by bolts 18. Its specific function is to serve as the load-bearing base of the upper components, transmit the power of the hydraulic press 8 to the punch 14, drive the punch 14 to move up and down, and at the same time provide installation positioning for components such as guide sleeve 9, support rod 5, and punch 14, so as to ensure that the position of each upper component is accurate and the movement is synchronized. Hydraulic press 8: The whole is a hydraulically driven power unit, there are two in total, and they are symmetrically fixedly installed at the top of the frame 2. The piston end is vertically downward and fixedly connected to the pressure plate 7. Its specific function is to provide the power required for stamping of the mold. Through the extension and retraction of the piston end, the pressure plate 7 and the punch 14 are driven to move up and down in the vertical direction to realize the stamping and return unloading of cold-formed steel billets. Guide sleeve 9: It is a cylindrical sleeve with a smooth inner wall. It is fixedly installed on both sides of the lower surface of the pressure plate 7, corresponding one-to-one with the guide post 10 on the die 3. The guide post 10 slides through the guide sleeve 9. Its specific function is to cooperate with the guide post 10 to form a guiding mechanism, restrict the movement direction of the pressure plate 7, and ensure that the pressure plate 7 can only slide up and down in the vertical direction. This prevents the pressure plate 7 from shifting and causing the punch 14 and die 3 to misalign, thus ensuring stamping accuracy. Guide post 10: It is a cylindrical metal rod with a smooth surface. It is fixedly installed on both sides of the upper surface of the die 3, corresponding one-to-one with the guide sleeve 9 on the pressure plate 7, and is slidably embedded in the guide sleeve 9. Its specific function is to serve as a guide reference and cooperate with the guide sleeve 9 to guide the movement trajectory of the pressure plate 7, so as to ensure that when the pressure plate 7 drives the punch 14 to move downward, it can accurately match the cavity of the die 3, avoid the scrapping of the stamping part or the damage to the mold due to the misalignment, and ensure the stamping accuracy. Rubber pad 11: A sheet or block-shaped component made of elastic rubber, in multiple quantities, uniformly fixedly installed on the upper surface of the die 3 around the cavity edge of the die 3. Its specific function is that during stamping, when the pad 4 presses down and contacts the rubber pad 11, the rubber pad 11 undergoes elastic deformation, buffering the impact force between the pad 4 and the die 3, protecting the upper surface of the die 3 and the lower surface of the pad 4 from wear, and preventing indentations on the surface of the stamped part due to hard contact. In addition, it can increase the friction between the cold-formed steel billet and the upper surface of the die 3, preventing the billet from shifting due to force during stamping, and ensuring forming accuracy. Ejector rod 12: The whole is a hydraulically driven cylindrical metal rod, four in total, distributed in a rectangle. The upper end is fixedly connected to the lower surface of the top plate 16, and the lower end is connected to the external hydraulic system. The specific function is that after the stamping is completed, the external hydraulic system drives the ejector rod 12 to extend upward. The ejector rod 12 pushes the top plate 16 to slide upward along the inner wall of the die 3, and ejects the formed workpiece from the cavity of the die 3, realizing automatic unloading of the workpiece without manual removal, thus improving mass production efficiency. Telescopic rod 13: It is an adjustable rod-shaped component, such as a hydraulic telescopic rod or a pneumatic telescopic rod. Its upper end is fixedly installed on the lower surface of the pressure plate 7 by bolts 18, and its lower end is fixedly connected to the upper surface of the upper die holder 15. Its specific function is to change the initial position of the upper die holder 15 inside the punch 14 by adjusting its own length, thereby adjusting the effective stamping height of the punch 14 to adapt to the stamping process of 1500MPa grade cold forming steel with different thicknesses and forming requirements. At the same time, during the stamping process, it provides stable support for the upper die holder 15, helps to maintain the structural stability of the punch 14, and avoids the punch 14 from deforming due to force. Punch 14: It is a block-shaped stamping component that is adapted to the cavity of die 3. It is detachably fixed to the lower surface of pressure plate 7 by bolts 18. The upper die base 15 is slidably installed inside, and the pad plate 4 is sleeved on the outside. Its specific function is to serve as the upper die component for cold forming steel stamping. It moves downward with the power of pressure plate 7 and hydraulic press 8, and cooperates with the cavity of die 3 to apply pressure to the cold forming steel blank placed on die 3, so that the blank undergoes plastic deformation to form a stamping part of the required shape. It is one of the core components for achieving precise stamping. Upper die holder 15: It is a rectangular block metal component that is slidably installed in the cavity inside the punch 14. Its upper surface is fixedly connected to the lower end of the telescopic rod 13, and its outer wall is in contact with the inner wall of the punch 14. Its specific function is to provide internal support for the punch 14, enhance the structural strength of the punch 14, and prevent the punch 14 from deforming or being damaged due to excessive force when stamping high-strength cold-formed steel materials of grade 1500MPa. At the same time, in conjunction with the length adjustment of the telescopic rod 13, the stamping parameters of the punch 14 can be adjusted to ensure that the punch 14 remains stable during the stamping process. Top plate 16: It is a rectangular metal plate that fits the bottom of the cavity of the die 3. It is slidably installed inside the bottom of the die 3. Its lower surface is fixedly connected to the upper end of the four ejector pins 12. Its upper surface can contact the stamped part. Its specific function is to fit against the bottom of the cavity of the die 3 during stamping to provide support for the blank. After stamping, it moves upward under the push of the ejector pins 12 to push the formed workpiece out of the cavity of the die 3, realize the separation of the workpiece from the die 3, complete the unloading action, and ensure the continuity of the mass production process. Lower die base 17: It is a block-shaped metal support component, which is fixedly installed on the upper surface of the base 1 and completely located inside the die 3. It fits against the inner wall of the die 3. Its specific function is to provide installation positioning and bottom support for the die 3, and to stably fix the die 3 on the base 1, so as to prevent the die 3 from shifting or shaking due to force during the stamping process. At the same time, it enhances the bottom structural strength of the die 3, prevents the die 3 from being damaged due to long-term stamping pressure, and ensures the service life and stamping stability of the die 3. Bolt 18: A standard threaded connector, several in number, inserted into the threaded holes of the pressure plate 7, respectively engaging with the flange of the punch 14 and the mounting holes of the telescopic rod 13. Its function is to detachably fix the punch 14 and the telescopic rod 13 under the pressure plate 7 through threaded connection, thereby achieving a stable connection between the punch 14, the telescopic rod 13 and the pressure plate 7. At the same time, it facilitates the disassembly and replacement of the punch 14 to meet the needs of different stamping parts or the repair of the telescopic rod 13 during subsequent maintenance, improving the versatility and maintenance convenience of the mold.

[0024] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A precision stamping die for mass production of 1500 MPa grade cold forming steel, comprising a base (1), characterized in that: A frame (2) is fixedly installed above the base (1). A lower mold base (17) is fixedly installed on the base (1), and the lower mold base (17) is located inside the cavity mold (3). A top plate (16) is slidably installed inside the cavity mold (3). Four push rods (12) are fixedly installed on the lower surface of the top plate (16). All four push rods (12) are hydraulically driven. Two guide pillars (10) are fixedly installed on both sides above the cavity mold (3). Multiple rubber pads (11) are fixedly installed on the upper surface of the cavity mold (3). Two hydraulic presses (8) are fixedly installed at the top of the frame (2), and pressure plates (7) are fixedly installed at the piston ends of the two hydraulic presses (8). Two guide sleeves (9) are fixedly installed below the pressure plates (7), and two guide columns (10) are slidably installed in the two guide sleeves (9). Four support rods (5) are slidably installed on the pressure plate (7). The lower ends of the four support rods (5) are fixedly connected to the pad (4). Four springs (6) are respectively sleeved on the four support rods (5). The upper ends of the springs (6) are fixedly connected to the lower surface of the pressure plate (7). The pressure plate (7) has a threaded hole and a bolt (18). A punch (14) is fixedly installed below the pressure plate (7) by the bolt (18). The pad (4) is sleeved on the outside of the punch (14) and can slide relative to the punch (14). An upper die seat (15) is slidably installed inside the punch (14). A telescopic rod (13) is fixedly installed at the upper end of the upper die seat (15). The upper end of the telescopic rod (13) is fixedly installed on the pressure plate (7) by the bolt (18).

2. The precision stamping die for mass production of 1500MPa grade cold-forming steel according to claim 1, characterized in that: The four push rods (12) are rectangularly distributed on the lower surface of the top plate (16), and the four push rods (12) are driven by the same hydraulic control system to achieve synchronous extension and retraction.

3. The precision stamping die for mass production of 1500MPa grade cold-forming steel according to claim 2, characterized in that: The outer side wall of the guide post (10) is provided with an axial guide protrusion, and the inner side wall of the guide sleeve (9) is provided with a guide groove that matches the guide protrusion. The guide protrusion is slidably embedded in the guide groove.

4. The precision stamping die for mass production of 1500MPa grade cold-forming steel according to claim 3, characterized in that: Multiple rubber pads (11) are evenly distributed around the cavity edge of the die (3), and the upper surface of the rubber pads (11) can contact and fit with the lower surface of the pad plate (4).

5. The precision stamping die for mass production of 1500MPa grade cold-forming steel according to claim 4, characterized in that: The spring (6) is in a slightly compressed state in the initial state, and the spring (6) applies a downward preload to the pad (4), so that the pad (4) always has a tendency to move towards the die (3).

6. The precision stamping die for mass production of 1500MPa grade cold-forming steel according to claim 5, characterized in that: The upper end of the punch (14) is provided with a flange, and the flange is provided with a through hole corresponding to the threaded hole of the pressure plate (7). The bolt (18) passes through the through hole and the threaded hole in sequence to detachably and fix the punch (14) and the pressure plate (7).

7. The precision stamping die for mass production of 1500MPa grade cold-forming steel according to claim 6, characterized in that: The outer side wall of the upper mold base (15) is provided with a limiting protrusion ring, and the inner side wall of the punch (14) is provided with a limiting step that matches the limiting protrusion ring. The limiting protrusion ring and the limiting step cooperate to prevent the upper mold base (15) from falling out of the punch (14).

8. The precision stamping die for mass production of 1500MPa grade cold-forming steel according to claim 7, characterized in that: The pad (4) is made of wear-resistant metal material, and the inner wall of the pad (4) is fitted with the outer wall of the punch (14) to ensure that the pad (4) slides smoothly along the axial direction of the punch (14).

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